#include<stdio.h>
int main()
{
	int k = 0;
	int a, b, c, d;
	for (k = 'a'; k <= 'd'; k++)
	{
		if ((k != 'a') + (k == 'c') + (k == 'd') + (k != 'd') == 3)
		{
			printf("killer is : %c\n", k);
		}
	}
	system("pause");
}
